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The air to cloth ratio of a fabric filter is

  • A.The pressure drop divided by the flow
  • B.The cleaning frequency per hour
  • C.Gas flow divided by total fabric area
  • D.The mass of dust divided by the mass of fabric

Answer: C

It expresses the average velocity through the medium and is the primary sizing parameter for a baghouse. Too high a value drives dust into the fabric, raises the pressure drop and shortens bag life, so it is chosen conservatively.

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